Sort of, by the end, Light became a total cunt, and I think that the only reason people wanted him to win was because characters such as Near and Mellow were just so terrible. If L hadn't died, I think that by the end of the series, many people would have been hoping that Light would be stopped.

Lelouche is one of the people changed by the world, but also the power he accumulates. While trying to avoid major spoilers, Lelouche gains a power that makes people do his will, once, and only once, most of the time he commands people to kill themselves after they finish their task in his mastermind plan. He has an obsession with chess, and that's all the two seasons are to him, one big chess game.

There is a loop hole in his power though, he can command anyone to do anything he wants once. which includes the command do everything I comand you always, which is like wishing for more wishes. But Lelouch didnt want to enslave people like that, so he never used that command until the final battle where his soldiers were enslaved like that.